Leonard Preston Diana

Leonard Preston Diana, General Attorney in New York

Over 47 years of legal practice · focused on General, IP, and M&A · 5.0/5 rating from 1 verified client review

Practicing general in New York since 1979.

47+
Years practicing
5.0 ★
1 client review
2
Bar admissions

Practices in

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Quick answer

Leonard Preston Diana is a partner based in New York, NY. The practice focuses on General, IP, and M&A. Leonard has over 47 years of legal experience. Currently practicing at Fitzpatrick, Cella, Harper & Scinto. Rated 5.0 out of 5 from 1 client review.

Based in
New York, NY
Experience
over 47 years
Known for
General · IP · M&A
  • Handles General, IP, and M&A matters from New York, NY.
  • Over 47 years of practice as a licensed attorney.
  • Recognized with AV Preeminent.

About Leonard Preston Diana: Leonard Preston Diana is a partner based in New York, NY. The practice focuses on General, IP, and M&A. Leonard has over 47 years of legal experience. Currently practicing at Fitzpatrick, Cella, Harper & Scinto. Rated 5.0 out of 5 from 1 client review.

Areas of practice

Legal matters Leonard takes on

Leonard concentrates on general, ip, m&a, and patent. Each area below outlines the kind of case Leonard handles, typical outcomes to expect, and how the intake process starts.

General cases in New York

Leonard takes general matters in New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Leonard agrees to represent you.

IP cases in New York

Leonard takes ip matters in New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Leonard agrees to represent you.

M&A cases in New York

Leonard takes m&a matters in New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Leonard agrees to represent you.

Patent cases in New York

Leonard takes patent matters in New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Leonard agrees to represent you.

Biography

Meet Leonard Preston Diana — general lawyer in New York

Leonard Preston Diana is a partner based in New York, NY. The practice focuses on General, IP, and M&A. Leonard has over 47 years of legal experience. Currently practicing at Fitzpatrick, Cella, Harper & Scinto. Rated 5.0 out of 5 from 1 client review.

Leonard Preston Diana is a lawyer practicing patent prosecution, licensing & transactions, pto contested proceedings and 1 other area of law. Leonard received a A.B. degree from Princeton University in 1975, and has been licensed for 47 years. Leonard practices at Fitzpatrick, Cella, Harper & Scinto in New York, NY.

How Leonard handles general matters

Leonard Preston Diana is a lawyer practicing patent prosecution, licensing & transactions, pto contested proceedings and 1 other area of law. Leonard received a A.B. degree from Princeton University in 1975, and has been licensed for 47 years. Leonard practices at Fitzpatrick, Cella, Harper & Scinto in New York, NY.

The kind of cases Leonard takes

Leonard reviews new inquiries case-by-case for general, ip, and m&a matters across New York.

Credentials

Education, bar admissions, and languages

  • Columbia University School of Law

    J.D. · 1978

  • Princeton University

    A.B. Physics · 1975

Jurisdictions

Leonard's state bar admissions

  • U.S. District Courts

    1980 · ACTIVE

  • New York

    1979 · ACTIVE

Leonard studied at J.D. in Columbia University School of Law and A.B. Physics in Princeton University.

Law school and academic background

Leonard completed J.D. in Columbia University School of Law and A.B. Physics in Princeton University. Formal legal training is one signal of substantive knowledge — the day-to-day practice Leonard runs in New York is where that training gets applied to real client questions.

Recognition

Recognition and thought leadership

Leonard has received 1 formal recognition from bar associations, industry bodies, and peer-review services.

  • AV Preeminent

Legal awards and honors

AV Preeminent.

Affiliations

Leonard's professional memberships and bar associations

  • New York Intellectual Property Law Association American Intellectual Property Law Association American Bar Association

    membership

Locations

Leonard Preston Diana's office in New York

Leonard's primary office is at 1290 Avenue of the Americas, New York, NY, 10104-3800. In-person meetings are by appointment; a phone intake usually comes first.

Main office

Fitzpatrick, Cella, Harper & Scinto

1290 Avenue of the Americas

New York, NY 10104-3800

Open in Google Maps

Client feedback

Client reviews of Leonard Preston Diana — 5.0/5 rating from 1 verified client review

Every review below is from a verified client of Leonard. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing general attorneys in New York.

5.0

1 client review

Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once Leonard Preston Diana claims this profile.

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Hiring guide

How to hire Leonard Preston Diana — what to expect in your first consultation

Working with a new general attorney should feel structured. Here's how the first two conversations with Leonard usually go, from the moment you request a consult to the day representation begins.

Consultation formats and pricing

Leonard charges for the initial consult. That fee is credited toward representation if you retain Leonard's office.

What to bring to your first meeting

Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Leonard will tell you what matters and what doesn't.

Questions to ask a general attorney in New York

A short list to run through before you commit: How many general matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?

Fees & payment

Fees, payment methods, and consultation options for Leonard

Leonard discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in general practice — ask which fits.

Hourly rates, contingency fees, and flat-fee options

Every general matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Leonard confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

Leonard's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many general practices work with clients on structured schedules.

Frequently asked

Frequently asked questions about Leonard Preston Diana

  • How much does it cost to hire Leonard for a general case?

    Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Leonard walks through the likely range during the consult so there are no surprises.

  • Does Leonard offer a free consultation?

    Leonard charges for the initial consult; that fee is credited toward representation if you retain Leonard's office. Some general attorneys offer free consults — check Leonard's current terms during booking.

  • How long do general cases in New York typically take?

    Simple general matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Leonard gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can Leonard take my case if I'm outside New York?

    Leonard is licensed in New York. Matters governed by New York law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Leonard will tell you if the case is a fit or refer you to someone closer to your court.

  • What should I bring to my first meeting with Leonard?

    Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Leonard will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is Leonard accepting new general clients right now?

    Leonard's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.

Areas served

General attorneys serving Albany and Brooklyn in New York

Leonard handles general matters throughout New York. Each city below is a direct link into the search page for verified general attorneys in that community.

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